Memory Game The Endocrine SystemOnline version Review the organs of the endocrine system and their functions. by Kathy Dilliplane Increase heart rate during a "Fight or Flight" response Pancreas Produces melatonin to regulate sleep cycles Thymus The body's "Master Gland" that controls the other endocrine organs. Regulates calcium levels in the blood. Testes Regulates growth and metabolism Parathyroid Glands Pituitary Regulate the male reproductive system Adrenal Glands Helps the immune system recognize and fight pathogens Regulates the female reproductive system Thyroid Ovaries Pineal Gland Regulates blood sugar levels